wiki: add Carbon Design System icons (2673) + pictograms (1000)

- 2673 SVG icons from @carbon/icons v11.82.0 (~2.5 MB)
- 1000 SVG pictograms from Carbon Design System (~2.0 MB)
- Updated 00-overview.md with asset structure and category listing

All icons: 32x32, fill: currentColor, optimized SVG
All pictograms: 24x24, fill: currentColor, SVG

assets/icons/carbon/activity.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>activity</title><path d="M12,29a1,1,0,0,1-.92-.62L6.33,17H2V15H7a1,1,0,0,1,.92.62L12,25.28,20.06,3.65A1,1,0,0,1,21,3a1,1,0,0,1,.93.68L25.72,15H30v2H25a1,1,0,0,1-.95-.68L21,7,12.94,28.35A1,1,0,0,1,12,29Z"/></svg>